/*      $NetBSD: cir.c,v 1.33 2022/03/31 19:30:16 pgoyette Exp $        */

/*
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Lennart Augustsson (lennart@augustsson.net).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cir.c,v 1.33 2022/03/31 19:30:16 pgoyette Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/poll.h>
#include <sys/select.h>
#include <sys/vnode.h>
#include <sys/module.h>

#include <dev/ir/ir.h>
#include <dev/ir/cirio.h>
#include <dev/ir/cirvar.h>

dev_type_open(ciropen);
dev_type_close(circlose);
dev_type_read(cirread);
dev_type_write(cirwrite);
dev_type_ioctl(cirioctl);
dev_type_poll(cirpoll);

const struct cdevsw cir_cdevsw = {
        .d_open = ciropen,
        .d_close = circlose,
        .d_read = cirread,
        .d_write = cirwrite,
        .d_ioctl = cirioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = cirpoll,
        .d_mmap = nommap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = D_OTHER
};

int cir_match(device_t parent, cfdata_t match, void *aux);
void cir_attach(device_t parent, device_t self, void *aux);
int cir_detach(device_t self, int flags);

CFATTACH_DECL_NEW(cir, sizeof(struct cir_softc),
    cir_match, cir_attach, cir_detach, NULL);

extern struct cfdriver cir_cd;

#define CIRUNIT(dev) (minor(dev))

int
cir_match(device_t parent, cfdata_t match, void *aux)
{
        struct ir_attach_args *ia = aux;

        return (ia->ia_type == IR_TYPE_CIR);
}

void
cir_attach(device_t parent, device_t self, void *aux)
{
        struct cir_softc *sc = device_private(self);
        struct ir_attach_args *ia = aux;

        sc->sc_dev = self;

        selinit(&sc->sc_rdsel);
        sc->sc_methods = ia->ia_methods;
        sc->sc_handle = ia->ia_handle;

#ifdef DIAGNOSTIC
        if (sc->sc_methods->im_read == NULL ||
            sc->sc_methods->im_write == NULL ||
            sc->sc_methods->im_setparams == NULL)
                panic("%s: missing methods", device_xname(sc->sc_dev));
#endif
        aprint_naive("\n");
        aprint_normal("\n");
}

int
cir_detach(device_t self, int flags)
{
        struct cir_softc *sc = device_private(self);
        int maj, mn;

        /* locate the major number */
        maj = cdevsw_lookup_major(&cir_cdevsw);

        /* Nuke the vnodes for any open instances (calls close). */
        mn = device_unit(self);
        vdevgone(maj, mn, mn, VCHR);

        seldestroy(&sc->sc_rdsel);

        return (0);
}

int
ciropen(dev_t dev, int flag, int mode, struct lwp *l)
{
        struct cir_softc *sc;
        int error;

        sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
        if (sc == NULL)
                return (ENXIO);
        if (!device_is_active(sc->sc_dev))
                return (EIO);
        if (sc->sc_open)
                return (EBUSY);

        sc->sc_rdframes = 0;
        if (sc->sc_methods->im_open != NULL) {
                error = sc->sc_methods->im_open(sc->sc_handle, flag, mode,
                    l->l_proc);
                if (error)
                        return (error);
        }
        sc->sc_open = 1;
        return (0);
}

int
circlose(dev_t dev, int flag, int mode, struct lwp *l)
{
        struct cir_softc *sc;
        int error;

        sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
        if (sc == NULL)
                return (ENXIO);
        if (sc->sc_methods->im_close != NULL)
                error = sc->sc_methods->im_close(sc->sc_handle, flag, mode,
                    l->l_proc);
        else
                error = 0;
        sc->sc_open = 0;
        return (error);
}

int
cirread(dev_t dev, struct uio *uio, int flag)
{
        struct cir_softc *sc;

        sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
        if (sc == NULL)
                return (ENXIO);
        if (!device_is_active(sc->sc_dev))
                return (EIO);
        return (sc->sc_methods->im_read(sc->sc_handle, uio, flag));
}

int
cirwrite(dev_t dev, struct uio *uio, int flag)
{
        struct cir_softc *sc;

        sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
        if (sc == NULL)
                return (ENXIO);
        if (!device_is_active(sc->sc_dev))
                return (EIO);
        return (sc->sc_methods->im_write(sc->sc_handle, uio, flag));
}

int
cirioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
{
        struct cir_softc *sc;
        int error;

        sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
        if (sc == NULL)
                return (ENXIO);
        if (!device_is_active(sc->sc_dev))
                return (EIO);

        switch (cmd) {
        case FIONBIO:
                /* All handled in the upper FS layer. */
                error = 0;
                break;
        case CIR_GET_PARAMS:
                *(struct cir_params *)addr = sc->sc_params;
                error = 0;
                break;
        case CIR_SET_PARAMS:
                error = sc->sc_methods->im_setparams(sc->sc_handle,
                            (struct cir_params *)addr);
                if (!error)
                        sc->sc_params = *(struct cir_params *)addr;
                break;
        default:
                error = EINVAL;
                break;
        }
        return (error);
}

int
cirpoll(dev_t dev, int events, struct lwp *l)
{
        struct cir_softc *sc;
        int revents;
        int s;

        sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
        if (sc == NULL)
                return (POLLERR);
        if (!device_is_active(sc->sc_dev))
                return (POLLERR);

        revents = 0;
        s = splir();
        if (events & (POLLIN | POLLRDNORM))
                if (sc->sc_rdframes > 0)
                        revents |= events & (POLLIN | POLLRDNORM);

#if 0
        /* How about write? */
        if (events & (POLLOUT | POLLWRNORM))
                if (/* ??? */)
                        revents |= events & (POLLOUT | POLLWRNORM);
#endif

        if (revents == 0) {
                if (events & (POLLIN | POLLRDNORM))
                        selrecord(l, &sc->sc_rdsel);

#if 0
                if (events & (POLLOUT | POLLWRNORM))
                        selrecord(p, &sc->sc_wrsel);
#endif
        }

        splx(s);
        return (revents);
}

MODULE(MODULE_CLASS_DRIVER, cir, "ir");

#ifdef _MODULE
#include "ioconf.c"
#endif

static int
cir_modcmd(modcmd_t cmd, void *opaque)
{
        int error = 0;
#ifdef _MODULE
        int bmaj = -1, cmaj = -1;
#endif

        switch (cmd) {
        case MODULE_CMD_INIT:
#ifdef _MODULE
                error = devsw_attach("cir", NULL, &bmaj, &cir_cdevsw, &cmaj);
                if (error)
                        return error;
                error = config_init_component(cfdriver_ioconf_cir,
                    cfattach_ioconf_cir, cfdata_ioconf_cir);
                if (error)
                        devsw_detach(NULL, &cir_cdevsw);
#endif
                return error;
        case MODULE_CMD_FINI:
#ifdef _MODULE
                return config_fini_component(cfdriver_ioconf_cir,
                    cfattach_ioconf_cir, cfdata_ioconf_cir);
                devsw_detach(NULL, &cir_cdevsw);
#endif
                return error;
        default:
                return ENOTTY;
        }
}